engine block identification. - Ford Mustang Forum
 
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post #1 of 9 (permalink) Old 04-11-2010 Thread Starter
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engine block identification.

so they guy i bought my car from said that it has a 4 bolt main block. it doesnt look like a 90s style block

1 reason my buddy said it was older becuase i have a plate next to the oil filter and he says that was for older engines with mechanicaly drove fuel pumps. dno if this helps

i assume to find out what block i have i would have to find the casting number.

what would a 91 5.0 block casting number be and is there any other ways of identifying what block it is.

car was originaly a 4cyl

1991 hatch 347 forged bottom end.
Tube front end, auburn rear, 5 lug conversion,TKO500
little bit of everything.
2002 blazer-sold 1998 mustang gt-sold 2004 silverado-Trade-in 1991 mustang-trailer queen. 2008 Chevy 2500 ltz duramax
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post #2 of 9 (permalink) Old 04-11-2010
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I doubt it is a 4-bolt block, it would be very sweet if it was!

The only 4-bolt production Ford small block I know of is the Boss 302 block. I could be wrong on this though...

'94 Laser red 'vert. Still a 5-oh... for now
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post #3 of 9 (permalink) Old 04-11-2010 Thread Starter
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i think it is a boss block but idk how to tell.

1991 hatch 347 forged bottom end.
Tube front end, auburn rear, 5 lug conversion,TKO500
little bit of everything.
2002 blazer-sold 1998 mustang gt-sold 2004 silverado-Trade-in 1991 mustang-trailer queen. 2008 Chevy 2500 ltz duramax
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post #4 of 9 (permalink) Old 04-11-2010
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Well if this helps this is where my casting number is on my 1969 351W block. View from the bottom, rear main is on the right side of the picture, obviously.
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'94 Laser red 'vert. Still a 5-oh... for now
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post #5 of 9 (permalink) Old 04-11-2010
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The numbers you need are right here. The ones beside the starter are casting numbers but the ones in this picture are the ones that'll tell you what the block came from.

They can be hard to even see, they're usually lightly stamped and can be covered in paint, grease, or rust.

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post #6 of 9 (permalink) Old 04-11-2010 Thread Starter
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i posted this on my other treat to about oil pan gasket.

it weird because after getting under the car where the oil pan gasket goes around the main journal the half moon shape looks like there is only one in the front

looking at the back the oil pan wraps around but it doesnt have any half moon shape its just flat as it wraps around the rear of my engine thats why i say it doesnt look like a normal 302 block

im all confused i think i have a freak block.

1991 hatch 347 forged bottom end.
Tube front end, auburn rear, 5 lug conversion,TKO500
little bit of everything.
2002 blazer-sold 1998 mustang gt-sold 2004 silverado-Trade-in 1991 mustang-trailer queen. 2008 Chevy 2500 ltz duramax
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post #7 of 9 (permalink) Old 04-11-2010
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Quote:
Originally Posted by chardiesel66 View Post
i think it is a boss block but idk how to tell.

The old Boss blocks had screw in freeze plugs with square centers in the middle of the plugs..... not the press in plugs....dead giveaway to the old Boss block. You need something like a socket extension (square part on the end) to fit into the square slots to take them out. All the rest of the blocks back then got the press in plugs..... and I don't mean brass. They never used brass until later on

Take a look at YLDPONYS 69 block pic. Notice the freeze plugs ?
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post #8 of 9 (permalink) Old 04-11-2010 Thread Starter
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i looked it has press in plugs. there not brass plugs. they look to be like a tin or other soft metal.

1991 hatch 347 forged bottom end.
Tube front end, auburn rear, 5 lug conversion,TKO500
little bit of everything.
2002 blazer-sold 1998 mustang gt-sold 2004 silverado-Trade-in 1991 mustang-trailer queen. 2008 Chevy 2500 ltz duramax
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post #9 of 9 (permalink) Old 04-12-2010 Thread Starter
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i took some pic of my oil pan. there is two plugs on the bottom back side of the oil pan my teacher said there are to get to the two rear bolts that i told you i couldnt see. they are allen key plugs
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1991 hatch 347 forged bottom end.
Tube front end, auburn rear, 5 lug conversion,TKO500
little bit of everything.
2002 blazer-sold 1998 mustang gt-sold 2004 silverado-Trade-in 1991 mustang-trailer queen. 2008 Chevy 2500 ltz duramax
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